Stank_Zaepernick-Rothe_
Stank_Zaepernick-Rothe_ The 2nd EuroSoTL conference, June 8-9 2017, Lund, Sweden The PDF-Concept – Triangulation and Analysis of Mathematical Tasks S. Stank and U. Zaepernick-Rothe, Ostfalia – University of Applied Sciences ABSTRACT: The PDF-concept was developed by Stank and Zaepernick-Rothe (2015; 2016) for the tutorial training with a mathematical focus. Presented by a triangle, it takes into a
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